ATAR Notes (Video Notes) Flashcards (Unit 3 only)

• What is a chemical system?

  A chemical system is a set of molecules, usually a chemical mixture with interacting molecules.
• What is the difference between an open and a closed chemical system?

  An open system allows matter and energy to be exchanged with the surroundings, while a closed system allows only energy, but not matter, to be exchanged with the surroundings.
• What is the difference between an open and a closed chemical system?

  An open system allows matter and energy to be exchanged with the surroundings, while a closed system allows only energy, but not matter, to be exchanged with the surroundings.
• How do physical changes differ from chemical changes at the atomic and molecular level?

  In physical changes, the atoms in the molecules stay the same and there is only a change in the position, spread, or movement of the molecules, but not their identity. In chemical changes, the atoms in the molecules change their arrangement and bonding to form new molecules.
• What is the symbol used to represent a reversible chemical reaction?


  ⇌
• What is the relationship between the forward and reverse reactions in a reversible chemical reaction at equilibrium?

  At equilibrium, the forward reaction (products → reactants) and the reverse reaction (reactants → products) occur at the same rate, so the concentrations of the products and reactants remain constant.
• What is a chemical system?

  A chemical system is a set of molecules, usually a chemical mixture with interacting molecules.
• What distinguishes an open system from a closed system?

  An open system allows matter and energy to be exchanged with the surroundings, while a closed system allows only energy exchange.